Lateral digital extensor muscle

Musculus extensor digitorum lateralis

Extends the digit and the carpus or tarsus.

System
Muscle
Region
Thoracic limb
Sides
Paired: left and right
Lateral digital extensor muscle (Musculus extensor digitorum lateralis) of the horse, left side: a three-quarter view of the muscle.

Where it runs from and to

A muscle is told apart from its neighbours by what it takes hold of at each end, which is also what decides what it does when it shortens.

Origin
In the forelimb, the elbow's outer collateral ligament and the outer radius and ulna; in the hind limb, the stifle's outer collateral ligament and the fibula.
Insertion
Front of the proximal phalanx in the forelimb; in the hind limb its tendon joins that of the long digital extensor on the cannon.
Action
Extends the digit and the carpus or tarsus.
Nerve
Radial nerve in the forelimb; fibular nerve in the hind limb.

Written for Vetomica in its own words from the standard reference anatomy of the horse; the books it was checked against are listed below.

Terminology

English
Lateral digital extensor muscle
Latin (NAV)
Musculus extensor digitorum lateralis
Status
A valid term in the Nomina Anatomica Veterinaria
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